<p> The INNER Planets MERCURY VENUS EARTH MARS Size and Small Small Small Small Composition Solid Solid Solid Solid Rocky Rocky Rocky Rocky Dense clouds of Nitrogen Thin Atmosphere No true atmosphere mostly carbon Oxygen Carbon dioxide dioxide, droplets of Other gases Nitrogen and argon sulfuric acid Great extremes Greenhouse effect Allow water to exist Temperatures 425º C in day 470ºC as solid, liquid, and -125ºC to 35ºC -170ºC at night gas Craters Craters Oceans Reddish-yellow rocks Surface Features High cliffs Cracks Land masses Rifts, craters, channels, Moon like surface volcanoes with lava Polar ice caps volcanoes, polar ice caps</p><p>Moons 1 2: Phobos, Deimos</p><p>Mariner 2 Mariner 9 Space Probes Mariner 10 Venera 7 Viking 1 & 2 Magellan Mars Surveyor Mars Pathfinder The Outer Planets</p><p>JUPITER SATURN URANUS NEPTUNE</p><p>(5th from Sun) (6th from Sun) (7th from Sun) (8th from Sun) Size and Large Large Large Large Composition Gaseous Gaseous Gaseous Gaseous</p><p> hydrogen hydrogen hydrogen hydrogen Atmosphere helium, ammonia, helium, ammonia, helium helium methane, water vapor methane, water vapor methane methane</p><p> ocean of liquid liquid hydrogen and liquid water liquid water Below the hydrogen and helium, helium, maybe a core of methane methane maybe a core of ice and ice and rock ammonia ammonia Atmosphere rock rocky core rocky core White, tan, red, brown Hundreds of rings, Thin dark rings, blue- Blue-green color, storms Notable clouds, (Great Red lowest density of all green color, sideways in atmosphere, rings with Features Spot), feint rings planets rotation gases At least 16: Io, Europa, 18 : Titan 18, maybe 21 8: Triton Moons Ganymede, Castillo</p><p>Voyager 1 & 2 Voyager 1& 2 Voyager 2 Voyager 2 Space Probes</p>